SKU: 73603684450

MMX Performance Coolant Expansion Cap 90mm - BMW

Sale price$88.44 Regular price$98.27
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Ships within 48 hours · Estimated delivery Aug 19 - Aug 24

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Description

MMX Performance Coolant Expansion Cap 90mm - BMWThe MMX Performance 90mm billet coolant expansion cap for BMWs has been designed from the ground up in the UK, from a solid piece of billet aluminium. Each cap was designed to directly replace the OE cap, not merely stuck in place. Fitment is for models with the matching OE (17 11 7 639 021) part number. Each MMX cap starts life as a solid billet of 6061 aerospace grade aluminium. It's meticulously machined from this billet with the latest CNC 5 axis

The MMX Performance 90mm billet coolant expansion cap for BMWs has been designed from the ground up in the UK, from a solid piece of billet aluminium.
Each cap was designed to directly replace the OE cap, not merely stuck in place. Fitment is for models with the matching OE (17 11 7 639 021) part number.
Each MMX cap starts life as a solid billet of 6061 aerospace-grade aluminium. It's meticulously machined from this billet with the latest CNC 5-axis technology, before being polished, then gloss-anodised to stay beautiful year after year.

All MMX coolant caps arrive pre-sealed and pre-installed with an OE spec valve and internal spring. No need to remove the valve assembly from your OE cap. A true plug and play solution.

It has been designed to instantly give your BMW an under-bonnet boost in the aesthetic department, finished in a deep gloss black anodised finish.

Never again will you worry whether you tightened your expansion cap fully, as the cap contains complete OE replacement internals. The carefully considered design gives ample surface grip area for your fingers, making installation and filling your coolant that little bit easier.

It joins an existing range of engine dress-up products for a complete under-bonnet transformation to your engine bay.

Feature heavy:
· Designed and engineered in the UK

· Crafted from 6061 aerospace-grade aluminium

· Full OE cap replacement

· Sophisticated internal springing and bleed off

· Anodised in MMX signature gloss black

· Joins existing range of MMX billet caps

· Pre-installed factory spec Viton O-Ring

 

Please check the underside of your factory expansion cap for the OE part number. It’s a larger cap, measuring roughly 90mm in diameter. The MMX billet coolant expansion cap for BMW fits OE part number 17 11 7 639 021.

Please note if the part is under excessive heat for prolonged periods of time, it can affect the overall finish, which is unavoidable with anodised aluminium products.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 73603684450

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Linde Lopez
Alexandria, US
★★★★★ 5
Great product
Color: Rose Gold #01, Size: 1 Fl Oz (Pack of 1)
This product is easy to use and looks great
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 13, 2026
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maryssa
Waukegan, US
★★★★★ 3
Cute, Smells like Chemicals
Color: Rose Gold #01, Size: 1 Fl Oz (Pack of 1), Color: Rose Gold #01, Size: 1 Fl Oz (Pack of 1)
Looks great but transfers easily. I liked the shade and how the glitter was visible but not distracting. I wasn’t fond of how it smelled but I covered the scent with my sunscreen and I didn’t notice afterwards. Smells like a chemical like scent but it was worth the value I paid for. Good as a highlighter, to add a touch of glow to the face. You can’t see it under foundation but it’s cute on the cheek bones to give a make up less look on a sunny day. The brush is also good quality.
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Reviewed in the United States on September 29, 2025
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Erika C
Los Angeles, US
★★★★★ 5
Quick glow up
Color: Glistening Bronze #03, Size: 1 Fl Oz (Pack of 1)
This is a great bronzing shimmer for a little added glow before walking out the door! It's very lightweight and goes on very smooth with brush. I ended up buying and using a larger kabuki brush to brush on faster but the brush it comes with works ok as well. It's the perfect amount of bronze and shimmer.. not glittery or over the top and doesn't have a smell. Doesn't transfer on clothes but I always let it dry a few minutes before putting on clothes.
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Reviewed in the United States on April 1, 2026
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Verified Purchase
Kim
Waukegan, US
★★★★★ 5
Beautiful Shimmer
Color: Rose Gold #01, Size: 1 Fl Oz (Pack of 1)
This worked well for a wedding. I thought it would be a little more bronzier but I loved the sparkle. It is my first time using a body shimmer though, so it did what I bought it for and next time just need to self tan prior!
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Reviewed in the United States on May 12, 2026
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La'akea Sisifo
Pawtucket, US
★★★★★ 5
Great product
Color: 2pcs
Helped my feet a lot I have been prego back to back and on my feet constantly it’s super moisturizing!
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Reviewed in the United States on March 6, 2026

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